Heat oven to 375°F. Arrange the bacon on slotted baking sheet or over wire rack set atop a baking sheet. Bake to crisp.
Whisk up yolk, lemon juice and Dijon in a large bowl, and continue to whisk while slowly pouring in grapeseed oil. Season aioli with salt to taste.
To the aioli or mayo base, whisk in pasted garlic and the Sriracha sauce.
Combine beef with salt, pepper, paprika, grated onion, Worcestershire and drizzle with oil. Form 6 patties thinner in the middle and thicker at the edges for even cooking.
Heat a griddle or grill pan or cast-iron skillet over medium-high heat and cook burgers 8-12 minutes, rare to well.
Serve burgers on buns with bacon, lettuce, tomato and red onion; slather burger tops with Sriracha aioli.